diff --git a/.chloggen/codeboten_dep-metricsstarttime.yaml b/.chloggen/codeboten_dep-metricsstarttime.yaml
new file mode 100644
index 0000000000000..72c93ec859289
--- /dev/null
+++ b/.chloggen/codeboten_dep-metricsstarttime.yaml
@@ -0,0 +1,4 @@
+change_type: 'deprecation'
+component: processor/metric_start_time
+note: Introduce new snake case compliant name `metric_start_time`
+issues: [46777]
diff --git a/.chloggen/config.yaml b/.chloggen/config.yaml
index a12915a68e13c..404d00108e8cc 100644
--- a/.chloggen/config.yaml
+++ b/.chloggen/config.yaml
@@ -202,8 +202,8 @@ components:
     - processor/logdedup
     - processor/logstransform
     - processor/lookup
+    - processor/metric_start_time
     - processor/metricsgeneration
-    - processor/metricstarttime
     - processor/metricstransform
     - processor/novadetector
     - processor/oracleclouddetector
diff --git a/processor/metricstarttimeprocessor/README.md b/processor/metricstarttimeprocessor/README.md
index 4e3f1310e297d..9a4c268a55a23 100644
--- a/processor/metricstarttimeprocessor/README.md
+++ b/processor/metricstarttimeprocessor/README.md
@@ -1,7 +1,7 @@
 <!-- status autogenerated section -->
 # Metric Start Time Processor
 
-The Metric Start Time Processor (`metricstarttime`) is used to set the start
+The Metric Start Time Processor (`metric_start_time`) is used to set the start
 time for metric points with a cumulative aggregation temporality. It is
 commonly used with the `prometheus` receiver, which usually produces metric
 points without a start time.
@@ -12,7 +12,7 @@ points without a start time.
 | Stability     | [beta]: metrics   |
 | Distributions | [contrib] |
 | Issues        | [![Open issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aopen%20label%3Aprocessor%2Fmetricstarttime%20&label=open&color=orange&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aopen+is%3Aissue+label%3Aprocessor%2Fmetricstarttime) [![Closed issues](https://img.shields.io/github/issues-search/open-telemetry/opentelemetry-collector-contrib?query=is%3Aissue%20is%3Aclosed%20label%3Aprocessor%2Fmetricstarttime%20&label=closed&color=blue&logo=opentelemetry)](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues?q=is%3Aclosed+is%3Aissue+label%3Aprocessor%2Fmetricstarttime) |
-| Code coverage | [![codecov](https://codecov.io/github/open-telemetry/opentelemetry-collector-contrib/graph/main/badge.svg?component=processor_metricstarttime)](https://app.codecov.io/gh/open-telemetry/opentelemetry-collector-contrib/tree/main/?components%5B0%5D=processor_metricstarttime&displayType=list) |
+| Code coverage | [![codecov](https://codecov.io/github/open-telemetry/opentelemetry-collector-contrib/graph/main/badge.svg?component=processor_metric_start_time)](https://app.codecov.io/gh/open-telemetry/opentelemetry-collector-contrib/tree/main/?components%5B0%5D=processor_metric_start_time&displayType=list) |
 | [Code Owners](https://github.com/open-telemetry/opentelemetry-collector-contrib/blob/main/CONTRIBUTING.md#becoming-a-code-owner)    | [@dashpole](https://www.github.com/dashpole), [@ridwanmsharif](https://www.github.com/ridwanmsharif) |
 
 [beta]: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/component-stability.md#beta
@@ -39,12 +39,12 @@ Example configurations:
 
 ```yaml
 processors:
-  metricstarttime:
+  metric_start_time:
 ```
 
 ```yaml
 processors:
-  metricstarttime:
+  metric_start_time:
     strategy: start_time_metric
     gc_interval: 1h
     start_time_metric_regex: "^.+_start_time$"
@@ -106,7 +106,7 @@ This strategy should only be used in limited circumstances:
 
 * When your application has a metric with the start time in Unix nanoseconds,
   such as `process_start_time`.
-* The metricstarttime processor is used _before_ any batching, so that the
+* The `metric_start_time` processor is used _before_ any batching, so that the
   batch of metrics all originate from a single application.
 * This strategy can be used when the collector is run as a sidecar to the
   application, where the collector's start time is a good approximation of the
diff --git a/processor/metricstarttimeprocessor/factory.go b/processor/metricstarttimeprocessor/factory.go
index df7f5e201a01b..d7335b3adfc16 100644
--- a/processor/metricstarttimeprocessor/factory.go
+++ b/processor/metricstarttimeprocessor/factory.go
@@ -11,6 +11,7 @@ import (
 	"go.opentelemetry.io/collector/consumer"
 	"go.opentelemetry.io/collector/processor"
 	"go.opentelemetry.io/collector/processor/processorhelper"
+	"go.opentelemetry.io/collector/processor/xprocessor"
 
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/metricstarttimeprocessor/internal/metadata"
 	"github.com/open-telemetry/opentelemetry-collector-contrib/processor/metricstarttimeprocessor/internal/starttimemetric"
@@ -20,10 +21,12 @@ import (
 
 // NewFactory creates a new metric start time processor factory.
 func NewFactory() processor.Factory {
-	return processor.NewFactory(
+	return xprocessor.NewFactory(
 		metadata.Type,
 		createDefaultConfig,
-		processor.WithMetrics(createMetricsProcessor, metadata.MetricsStability))
+		xprocessor.WithMetrics(createMetricsProcessor, metadata.MetricsStability),
+		xprocessor.WithDeprecatedTypeAlias(metadata.DeprecatedType),
+	)
 }
 
 // createMetricsProcessor creates a metrics processor based on provided config.
diff --git a/processor/metricstarttimeprocessor/generated_component_test.go b/processor/metricstarttimeprocessor/generated_component_test.go
index 88beaddc8531e..6a007ae4f64a7 100644
--- a/processor/metricstarttimeprocessor/generated_component_test.go
+++ b/processor/metricstarttimeprocessor/generated_component_test.go
@@ -20,7 +20,7 @@ import (
 	"go.opentelemetry.io/collector/processor/processortest"
 )
 
-var typ = component.MustNewType("metricstarttime")
+var typ = component.MustNewType("metric_start_time")
 
 func TestComponentFactoryType(t *testing.T) {
 	require.Equal(t, typ, NewFactory().Type())
diff --git a/processor/metricstarttimeprocessor/go.mod b/processor/metricstarttimeprocessor/go.mod
index b228eced245d0..2263def31b56e 100644
--- a/processor/metricstarttimeprocessor/go.mod
+++ b/processor/metricstarttimeprocessor/go.mod
@@ -16,6 +16,7 @@ require (
 	go.opentelemetry.io/collector/processor v1.53.1-0.20260306010043-a44ab254898b
 	go.opentelemetry.io/collector/processor/processorhelper v0.147.1-0.20260306010043-a44ab254898b
 	go.opentelemetry.io/collector/processor/processortest v0.147.1-0.20260306010043-a44ab254898b
+	go.opentelemetry.io/collector/processor/xprocessor v0.147.1-0.20260306010043-a44ab254898b
 	go.opentelemetry.io/otel v1.41.0
 	go.uber.org/goleak v1.3.0
 	go.uber.org/zap v1.27.1
@@ -48,7 +49,6 @@ require (
 	go.opentelemetry.io/collector/pdata/testdata v0.147.1-0.20260306010043-a44ab254898b // indirect
 	go.opentelemetry.io/collector/pdata/xpdata v0.147.1-0.20260306010043-a44ab254898b // indirect
 	go.opentelemetry.io/collector/pipeline v1.53.1-0.20260306010043-a44ab254898b // indirect
-	go.opentelemetry.io/collector/processor/xprocessor v0.147.1-0.20260306010043-a44ab254898b // indirect
 	go.opentelemetry.io/otel/metric v1.41.0 // indirect
 	go.opentelemetry.io/otel/sdk v1.41.0 // indirect
 	go.opentelemetry.io/otel/sdk/metric v1.41.0 // indirect
diff --git a/processor/metricstarttimeprocessor/internal/metadata/generated_status.go b/processor/metricstarttimeprocessor/internal/metadata/generated_status.go
index 48216e0d97fea..e07bda3b75fbb 100644
--- a/processor/metricstarttimeprocessor/internal/metadata/generated_status.go
+++ b/processor/metricstarttimeprocessor/internal/metadata/generated_status.go
@@ -7,8 +7,9 @@ import (
 )
 
 var (
-	Type      = component.MustNewType("metricstarttime")
-	ScopeName = "github.com/open-telemetry/opentelemetry-collector-contrib/processor/metricstarttimeprocessor"
+	Type           = component.MustNewType("metric_start_time")
+	DeprecatedType = component.MustNewType("metricstarttime")
+	ScopeName      = "github.com/open-telemetry/opentelemetry-collector-contrib/processor/metricstarttimeprocessor"
 )
 
 const (
diff --git a/processor/metricstarttimeprocessor/metadata.yaml b/processor/metricstarttimeprocessor/metadata.yaml
index 67bdd2e54934c..c36496c8cc16d 100644
--- a/processor/metricstarttimeprocessor/metadata.yaml
+++ b/processor/metricstarttimeprocessor/metadata.yaml
@@ -1,9 +1,10 @@
 display_name: Metric Start Time Processor
-type: metricstarttime
+type: metric_start_time
+deprecated_type: metricstarttime
 
 
 description: |
-  The Metric Start Time Processor (`metricstarttime`) is used to set the start
+  The Metric Start Time Processor (`metric_start_time`) is used to set the start
   time for metric points with a cumulative aggregation temporality. It is
   commonly used with the `prometheus` receiver, which usually produces metric
   points without a start time.
diff --git a/processor/metricstarttimeprocessor/testdata/config.yaml b/processor/metricstarttimeprocessor/testdata/config.yaml
index 4bfe0531df041..5074c94e3fbb8 100644
--- a/processor/metricstarttimeprocessor/testdata/config.yaml
+++ b/processor/metricstarttimeprocessor/testdata/config.yaml
@@ -1,28 +1,28 @@
-metricstarttime:
+metric_start_time:
 
-metricstarttime/subtract_initial_point:
+metric_start_time/subtract_initial_point:
   strategy: subtract_initial_point
 
-metricstarttime/gc_interval:
+metric_start_time/gc_interval:
   gc_interval: 1h
 
-metricstarttime/negative_interval:
+metric_start_time/negative_interval:
   gc_interval: -1h
 
-metricstarttime/true_reset_point:
+metric_start_time/true_reset_point:
   strategy: true_reset_point
 
-metricstarttime/start_time_metric:
+metric_start_time/start_time_metric:
   strategy: start_time_metric
   start_time_metric_regex: "^.+_process_start_time_seconds$"
 
-metricstarttime/invalid_regex:
+metric_start_time/invalid_regex:
   strategy: start_time_metric
   start_time_metric_regex: "(((("
 
-metricstarttime/invalid_strategy:
+metric_start_time/invalid_strategy:
   strategy: bad
 
-metricstarttime/regex_with_subtract_initial_point:
+metric_start_time/regex_with_subtract_initial_point:
   strategy: subtract_initial_point
   start_time_metric_regex: "^.+_process_start_time_seconds$"
\ No newline at end of file
diff --git a/receiver/prometheusreceiver/documentation.md b/receiver/prometheusreceiver/documentation.md
index 953ec134357d3..4f9273b03b10a 100644
--- a/receiver/prometheusreceiver/documentation.md
+++ b/receiver/prometheusreceiver/documentation.md
@@ -12,7 +12,7 @@ This component has the following feature gates:
 | `receiver.prometheusreceiver.EnableNativeHistograms` | stable | Converts scraped Prometheus native histograms into OpenTelemetry exponential histograms. You still need to configure 'scrape_native_histograms: true' in your Prometheus scrape config to actually scrape native histograms. For mixed histograms (both classic and native), only the native histogram buckets are used. | v0.142.0 | v0.145.0 | [Link](https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/34473) |
 | `receiver.prometheusreceiver.EnableReportExtraScrapeMetrics` | deprecated | Enables reporting of extra Prometheus scrape metrics. This gate is deprecated, use the `extra_scrape_metrics` Prometheus scrape configuration instead. | v0.143.0 | v0.148.0 | [Link](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/44181) |
 | `receiver.prometheusreceiver.RemoveReportExtraScrapeMetricsConfig` | stable | This gate is always enabled and cannot be turned off. The 'report_extra_scrape_metrics' configuration option is always ignored. The extra scrape metrics are controlled by the EnableReportExtraScrapeMetrics feature gate, unless otherwise specified in the Prometheus scrape configuration. | v0.143.0 | v0.148.0 | [Link](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/44181) |
-| `receiver.prometheusreceiver.RemoveStartTimeAdjustment` | stable | When enabled, the Prometheus receiver will leave the start time unset. Use the metricstarttime processor instead if you need this functionality. | v0.121.0 | v0.142.0 | [Link](https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/36364) |
+| `receiver.prometheusreceiver.RemoveStartTimeAdjustment` | stable | When enabled, the Prometheus receiver will leave the start time unset. Use the metric_start_time processor instead if you need this functionality. | v0.121.0 | v0.142.0 | [Link](https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/36364) |
 | `receiver.prometheusreceiver.UseCreatedMetric` | deprecated | When enabled, the Prometheus receiver will retrieve the start time for Summary, Histogram and Sum metrics from _created metric. | v0.89.0 | v0.141.0 | [Link](https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/21909) |
 
 For more information about feature gates, see the [Feature Gates](https://github.com/open-telemetry/opentelemetry-collector/blob/main/featuregate/README.md) documentation.
diff --git a/receiver/prometheusreceiver/internal/metadata/generated_feature_gates.go b/receiver/prometheusreceiver/internal/metadata/generated_feature_gates.go
index 7b10e4937ead4..508f14b962a65 100644
--- a/receiver/prometheusreceiver/internal/metadata/generated_feature_gates.go
+++ b/receiver/prometheusreceiver/internal/metadata/generated_feature_gates.go
@@ -44,7 +44,7 @@ var ReceiverPrometheusreceiverRemoveReportExtraScrapeMetricsConfigFeatureGate =
 var ReceiverPrometheusreceiverRemoveStartTimeAdjustmentFeatureGate = featuregate.GlobalRegistry().MustRegister(
 	"receiver.prometheusreceiver.RemoveStartTimeAdjustment",
 	featuregate.StageStable,
-	featuregate.WithRegisterDescription("When enabled, the Prometheus receiver will leave the start time unset. Use the metricstarttime processor instead if you need this functionality."),
+	featuregate.WithRegisterDescription("When enabled, the Prometheus receiver will leave the start time unset. Use the metric_start_time processor instead if you need this functionality."),
 	featuregate.WithRegisterReferenceURL("https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/36364"),
 	featuregate.WithRegisterFromVersion("v0.121.0"),
 	featuregate.WithRegisterToVersion("v0.142.0"),
diff --git a/receiver/prometheusreceiver/metadata.yaml b/receiver/prometheusreceiver/metadata.yaml
index 0e299a30b9c59..76b3f623b2caf 100644
--- a/receiver/prometheusreceiver/metadata.yaml
+++ b/receiver/prometheusreceiver/metadata.yaml
@@ -67,7 +67,7 @@ feature_gates:
     stage: stable
     description: >-
       When enabled, the Prometheus receiver will leave the start time unset.
-      Use the metricstarttime processor instead if you need this functionality.
+      Use the metric_start_time processor instead if you need this functionality.
     from_version: v0.121.0
     to_version: v0.142.0
     reference_url: https://github.com/open-telemetry/opentelemetry-collector-contrib/pull/36364
diff --git a/reports/distributions/contrib.yaml b/reports/distributions/contrib.yaml
index 0afe4d579a451..84b2cf93d3f5f 100644
--- a/reports/distributions/contrib.yaml
+++ b/reports/distributions/contrib.yaml
@@ -111,8 +111,8 @@ components:
         - isolationforest
         - k8s_attributes
         - logdedup
+        - metric_start_time
         - metricsgeneration
-        - metricstarttime
         - metricstransform
         - probabilistic_sampler
         - redaction